Ya that's about the only difference. Personally I would go with the $699 model with a true SSD and bump up to the i7 processor and maybe get 16GB of ram..I'm thinking about ordering one after the holidays and that's what I would do.
I maxed one out (other than SSD size, just stuck with 256GB) when they released them and so far it has done a really good job, though I don't usually render videos.